Circuit-breaker disk and method of making same



Feb. 20, 1923. 1,446,020 H. SCHMID CIRCUIT BREAKER DISK AND METHOD OF MAKING'SAME Filed Aug. 28, 1920 I NVENTOR HERMAN ScHMm.

ATTORNEY.

the disk and screwing tightly into the body oi the armature to hold the armature shaft 9, and the disk 1, with the key 7 in the key way '10, together. By this method of conmeeting the circuit breaker disk and the shaft the disk will be carried upon the end 0'! the shaft and turn with same as the armature revolves between the pole pieces of the magneto to generate current.

By the usual method of making the key 7 the disk is formed first and then placed in a iii-:ture by which part of the boss 3 is compressed. in a. manner indicated by the arrows in Fig. Thus some of the metal on the outside ot the bossis squeezed up to make the key 7. this squeezing does not take place until after the material forming the di k has become set, the additional force supplied to the boss 3 causes the metal in the key '7 to take a very strained. position; the elasticity of the material employed constantly tending to obliterate this key and return to the boss 3, its smooth round outside surface. As a result, when the key is made in this way, by squeezing the boss 3, it is by no means permanent but often becomes very indistinct and perhaps even fades out. Then one must put the toy back into the fixture and squeeze it as before to make the key over. After a few treatments of this sort. the key may break otl, as indicated by the broken line on top of the boss 3, in Fig. 2. The disk is then useless for further serv ice. Such mishaps are especially liable to occur it the 'ivorkman is not thoroughly skilled in performing the operation; although it is possible that when the metal of the boss 3 is squeezed as describeth if the job is properly done, the key? will be formed large enough and the metal will not go back more than slight distance towards its original shape. But at best the key will be weak and likely to break oil; it not at once. then after the magneto goes into service: and. much trouble will. thus be entailed and subsequent repairs and expense necessitated.

In the practice oil. this invention l1 form the key 7 when the material out of which the disk is manufactured, is taking shape and becoming set, to provide the various parts of the disk' Then the boss 3 does not have to be squeezed or forced outwards, and this boss is not subjected to further stresses of any sort to 'torce it to assume an unnatnral, strained or temporary position. The

key is termed at the same time that the disk and various parts thereof are given their permanent shape; consequently there is no tendency of the metal to relieve itsell from any additional stresses and the key does not tend to work back and merge itself into the "Once the disk is the key is perlioss which carries it. formed with the key thereon, nianent, rigid and with all its structural strength unimpaired and does not afterward break off; and the disk is capable of much longer service and much more efficient operation.

ln order to provide a key adapted to give this result the breaker disk can be manufactured either by casting or by forging or according to any other method, so long as the key 7 is compelled to take shape, and assume its permanent position at the same time that the other parts of the breaker disk are torming; and no additional force is used to make any part of the boss 3 go into an unnatural, strained position afterwards.

By means of a disk so constructed all of l e troubles which are now encountered due to the breaking of keys are avoided; and the metal of the key, instead of being strained and greatly weakened as when the solid metal of the boss is forced out to form the key, leaving the metal of the key with little or nosupport at its back, when the key is made by pushing in and pushing out, is an integral part of the boss itself, attord ing a perfectly rigid and durable construction.

Having; described my invention what .l believe to be new and desire to secure and protect by Letters Patent ot the United States, is

1. The method of making a disk for carryin;- a circuit breaker of a magneto, with a key there be actuated by the movable member of said magneto, said method consisting in "forming key on the boss of the disk at the time the body and the various parts of the disk are given their shape; without subjecting the metal of the disk to any additional stresses afterwards: thereby providing on the boss of the disk a key which is perfectly rigid and permanent with respect to the disk and which is of maximum strength and rigidity.

2. A disk tor the circuit breaker of a mag neto, said disk having a boss extending from its rear face for insertion into the end of the sl'iatt of the movable member of the in apgneto, the boss beinn; provided with. a key on its external surface, said keyoccupying a natural unstrained position with respect to the boss and other parts Of the disk. and being without tendency to work back and merge with the substance torming the disk and boss, and constituting; permanent tea-- ture thereof.

In testimony whereof, I have signed my name to this specification this 2nd day of Augu st 1920:

HERMAN SCHMID,

. {0 enable the disk to engage and 

